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Fatty acids inhibit insulin-mediated glucose transport associated with actin remodeling in rat L6 muscle cells.
MedLine Citation:
PMID:  20848165     Owner:  NLM     Status:  In-Process    
In skeletal muscle cells, insulin stimulates cytoskeleton actin remodeling to facilitate the translocation of glucose transporter GLUT4 to plasma membrane. Defect of insulin-induced GLUT4 translocation and actin remodeling may cause insulin resistance. Free fatty acids cause insulin resistance in skeletal muscle. The aim of this study was to investigate the effects of fatty acids on glucose transport and actin remodeling. Differentiated L6 muscle cells expressing c-myc epitope-tagged GLUT4 were treated with palmitic acid, linoleic acid and oleic acid. Surface GLUT4 and 2-deoxyglucose uptake were measured in parallel with the morphological imaging of actin remodeling and GLUT4 immunoreactivity with fluorescence, confocal and transmission electron microscopy. Differentiated L6 cells showed concentration responses of insulin-induced actin remodeling and glucose uptake. The ultrastructure of insulin-induced actin remodeling was cell projections clustered with actin and GLUT4. Acute and chronic treatment with the 3 fatty acids had no effect on insulin-induced actin remodeling and GLUT4 immunoreactivity. However, insulin-mediated glucose uptake significantly decreased by palmitic acid (25, 50, 75, 100 μmol/L), oleic acid (180, 300 μmol/L) and linoleic acid (120, 180, 300 μmol/L). Oleic acid (120, 300 μmol/L) and linoleic acid (300 μmol/L), but not palmitic acid, significantly decreased insulin-mediated GLUT4 translocation. These data suggest that fatty acids inhibit insulin-induced glucose transport associated with actin remodeling in L6 muscle cells.
Hai-Lu Zhao; Li-Zhong Liu; Yi Sui; Stanley K S Ho; Shuk-Kuen Tam; Fernand M M Lai; Juliana C N Chan; Peter C Y Tong
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-17
Journal Detail:
Title:  Acta diabetologica     Volume:  47     ISSN:  1432-5233     ISO Abbreviation:  Acta Diabetol     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-10-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9200299     Medline TA:  Acta Diabetol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  331-9     Citation Subset:  IM    
Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong SAR, China.
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